How to use the gspread.utils.a1_to_rowcol function in gspread

def value_range(self, rng):
        """Returns a list of values in a range."""
        start, end = rng.split(':')
        (row_offset, column_offset) = a1_to_rowcol(start)
        (last_row, last_column) = a1_to_rowcol(end)

        out = []
        for col in self.values[row_offset - 1:last_row]:
            out.extend(col[column_offset - 1:last_column])
        return out

def get_cell_as_tuple(cell):
    """Take cell in either format, validate, and return as tuple."""
    if type(cell) == tuple:
        if (
            len(cell) != 2
            or not np.issubdtype(type(cell[ROW]), np.integer)
            or not np.issubdtype(type(cell[COL]), np.integer)
        ):
            raise TypeError("{0} is not a valid cell tuple".format(cell))
        return cell
    elif isinstance(cell, basestring):
        if not match("[a-zA-Z]+[0-9]+", cell):
            raise TypeError("{0} is not a valid address".format(cell))
        return a1_to_rowcol(cell)
    else:
        raise TypeError("{0} is not a valid format".format(cell))

:param value_render_option: (optional) Determines how values should be
                                    rendered in the the output. See
                                    `ValueRenderOption`_ in the Sheets API.
        :type value_render_option: str

        .. _ValueRenderOption: https://developers.google.com/sheets/api/reference/rest/v4/ValueRenderOption

        Example:

        >>> worksheet.acell('A1')
        

        """

        return self.cell(
            *(a1_to_rowcol(label)),
            value_render_option=value_render_option
        )